Heteroepitaxy growth of GaAsBi on Ge(100) substrate by gas source molecular beam epitaxy

Peng Wang, Wenwu Pan, Xiaoyan Wu, Chunfang Cao, Shumin Wang, Qian Gong

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We have investigated the growth of GaAsBi single-crystal film on Ge substrate by gas source molecular beam epitaxy. A high-quality GaAsBi epilayer has been obtained. It has been found that the surfactant effect of Bi suppresses the interdiffusion of Ge at the GaAsBi/Ge interface and reduces the misfit dislocation density. The Bi atoms occupy the As sites, as indicated by the appearance of GaBi-like TO(Γ) and LO(Γ) phonon modes in Raman spectra. In addition, the redshift of the GaAs-like LO(Γ) phonon frequency has been observed in the Raman spectra, owing to the Bi-induced biaxial strain and the alloying effect as well.
Original languageEnglish
Pages (from-to)45502
JournalApplied Physics Express
Volume9
Issue number4
DOIs
Publication statusPublished - 1 Apr 2016
Externally publishedYes

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